1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW15329 Determination of the Modulus of Rigidity in Shear for Adhesives Used in Glass Bonding Applications Copyright 2011 General Motors Company All Rights Reserved June 2011 Originating Department: North American Engineering Standards Page 1 of 4 1 S
2、cope This standard describes a test procedure to determine the modulus of rigidity in shear of polyurethane adhesives used for bonding stationary glass and encapsulating glass. Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of conflict between the Engli
3、sh and domestic language, the English language shall take precedence. 1.1 Purpose. Not applicable. 1.2 Foreword. Not applicable. 1.3 Applicability. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications.
4、None 2.2 GM Standards/Specifications. 9981062 GMW3221 B 040 0007 3 Resources 3.1 Facilities. Not applicable. 3.2 Equipment. 3.2.1 VM and P Naphtha (9981062), Test Petrol B 040 0007 or equivalent cleaning solvent. 3.2.2 Razor knife. 3.2.3 Air operated or electric adhesive cartridge dispense gun. 3.2.
5、4 Air regulator. 3.2.5 Tensile tester capable of pulling 2000 N with a crosshead speed of 100 mm/minute at 10% strain. 3.2.6 Coupon holding racks capable of maintaining a 6 2.0 mm bond height between upper and lower bonded test coupons. The racks are to be used in conjunction with specified substrat
6、e thickness. 3.2.7 Test Substrate. 3.2.7.1 Test substrates are to be E-coated coupons with the following dimensions: Width25 mm Thickness0.8 to 1.0 mm Length100 mm 3.3 Test Vehicle/Test Piece. 3.3.1 Test Material. 3.3.1.1 Fixed glass bonding adhesive. 3.4 Test Time. Not applicable. Copyright General
7、 Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15329 Copyright 2011 General Motors Company All Rights Reserved June 2011 Page 2 of 4 Calendar time: Days
8、Test hours: hours Coordination hours: hours 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure Summary of Test Procedure. This test procedure is used to determine the modulus of rigidity in shear of fixed glass bonding adhesives when uniformly applied be
9、tween two sample substrates and pulled in shear to failure. Standard Conditions. All testing in standard conditions to this specification shall be performed in accordance with GMW3221 Code A, Procedure for Standard Conditions of Organic Materials. 4.1 Preparation. 4.1.1 Test Sample Preparation. 4.1.
10、1.1 Prepare the appropriate number of shear test specimens for each test condition as dictated by the material specification. If not specified prepare five shear test specimens for each test condition. 4.1.1.2 Clean all substrates with varnish makers (VM) and paint (P) Naphtha or Test Petrol B 040 0
11、007 unless otherwise specified. 4.1.1.3 In order to prevent squeeze-out from bonding to the substrate outside of the bond area, mask each coupon with masking tape leaving the bond area exposed. 4.1.1.4 Place one coupon of each set on the coupon holding rack with 1 mm spacing minimum between samples.
12、 Bonding area of coupons must be on the inner edge of the coupon rack. Secure the opposite end of coupons to the holding rack with tape. 4.1.1.5 Apply a bead of the adhesive at the end of the coupon. The finished bead dimensions of the cured assembly are 10 6 25 mm3 (dimension tolerances of 2.0 mm a
13、t each dimension). 4.1.1.6 Within 5 minutes of applying cold applied and 1 minute of warm applied adhesive, position the coupons of the remaining substrate over the racked coupons so as to sandwich the adhesive between the appropriate portions of the coupons. Secure the rear end of the upper test co
14、upons to the holding rack with tape. See Figure 1 for shear adhesion assembly. All dimensions in mm Figure 1: Lap Shear Assembly 4.1.1.7 Unless otherwise specified, cure at 22 3 C and 50 5% relative humidity (RH) for a minimum of 168 hours prior to removing from the rack and subjecting the specimens
15、 to additional environments. Record the actual temperature, relative humidity and time of cure. 4.1.1.8 Trim the excess adhesive with a razor knife to give the specified bond dimensions. 4.1.1.9 After environments, allow the test specimens 12 to 24 hours recovery time at ambient conditions. 4.2 Cond
16、itions. 10 5 6 25 100 All dimensions in mm. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15329 Copyright 2011 General Motors Company A
17、ll Rights Reserved June 2011 Page 3 of 4 4.2.1 Environmental Conditions. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Test Pro
18、cedure. Pull the bonded coupons in shear to a minimum load of 200 N in a tensile test machine at a crosshead speed of 100 mm/minute. Record the load values at 10% strain. 5 Data 5.1 Calculations. 5.1.1 Evaluation and Rating. 5.1.1.1 Calculation. Readings are obtained from the slope of the “least squ
19、are fit” straight line, made through the steepest linear region of the curve. G = (P x t)/(A x d) Where: G = modulus of rigidity in shear in Mpa P = Maximum load in N A = bond area in mm2 t = bond height in mm d = displacement in mm 5.2 Interpretation of Results. Not applicable. 5.3 Test Documentati
20、on. 5.3.1 Report. 5.3.1.1 Record all materials used during testing including the following information. 5.3.1.1.1 Test material source identification. 5.3.1.1.2 Test material product identification. 5.3.1.1.3 Test material batch numbers. 5.3.1.1.4 Substrate identification. 5.3.1.2 Record the followi
21、ng test results. 5.3.1.2.1 P: Maximum load N. 5.3.1.2.2 D: displacement mm. 5.3.1.2.3 A: bond area mm2. 5.3.1.2.4 T: bond height mm. 5.3.1.2.5 G: modulus of rigidity in shear Mpa. 5.3.1.3 Criteria for acceptable results are determined by the material specification. 6 Safety This standard may involve
22、 hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitat
23、ions prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. RH Relative Humidity VM and P Varnish Makers and Paint Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted wi
24、thout license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15329 Copyright 2011 General Motors Company All Rights Reserved June 2011 Page 4 of 4 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW15329 9 Release and Revisions This stand
25、ard was originated in May 2006. It was first approved by the GM Global Glass Bonding Adhesive and Sealer Team August 2006. It was first published in September 2006. Issue Publication Date Description (Organization) 1 SEP 2006 Initial publication. 2 JUN 2011 Five Year Refresh (Global Adhesives Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
